SQL for Java Devs · interview question

How can you avoid the N+1 query problem when fetching orders and their items in a single transaction?

Multiple choiceHardchapter-8-curatedpremiumsql-for-java-devsjoins

Execute separate queries for orders and itemsUse batch processing for each itemUse a JOIN to fetch orders and items togetherRetrieve orders first, then fetch items one by one

Answer and explanation

Correct answer

C. Use a JOIN to fetch orders and items together

Why

Using a JOIN to fetch both orders and items in one query allows you to load all related data at once, preventing the N+1 query problem where each order would otherwise trigger a separate query for its items.

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How can you avoid the N+1 query problem when fetching orders and their items in a single transaction?

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